Let’s look first at the teeth of animals grouped by their diet:
Carnivores. Animals that only eat meat, like tigers, have large canines, often fangs, which help them seize and kill their prey. Their incisors—or front teeth—are not nearly as big and these animals don't need molars for grinding food. Instead, they have teeth that slice meat, called carnassial teeth.
Herbivores. In grass- and leaf-eating animals like cows, the incisors are large, the canines are small, and the molars have wide tops to grind the vegetation they eat.
Frugivores. In animals that eat fruits and vegetables, all the teeth are about the same height. The canines stick out a little, but not at all like those of the carnivores. The molars are wide on top but not pointed for chewing flesh like the carnivores’.
Omnivores. In animals like bears that eat meat and vegetation, the incisors look like those of herbivores, the canines look like those of carnivores, and the molars are both pointed and wide on top to help them consume both flesh and vegetation.
Now if we observe the teeth in humans, we find that they do not resemble those of meat-eaters, nor of herbivores or omnivores. People’s teeth parallel, exactly, those of the frugivores.
The structure of the digestive canal is also revealing:
answer this question is to compare the teeth and the digestive system of humans with those of animals that eat mostly fruits and vegetables, animals in the frugivorous group. Beyond our natural adverse reaction to raw meat and the slaughter of animals, this comparison leads me to believe that we’re not meant to eat meat, at least not the muscular meat of large animals. If we weren’t able to prepare meat by cooking and hide its flavor with spices and sauces, we would probably avoid killing animals and eating their flesh.
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